JPS6142836A - Manufacture of fluorescent lamp - Google Patents

Abstract

PURPOSE:To produce a U-shaped fluorescent lamp which has good quality and can be efficiently mass-produced by applying a high-quality fluorescent film on the inner surface of the lamp before rolling it by using a device for manufacturing an ordinary straight fluorescent lamp. CONSTITUTION:First, a fluorescent film 7 is applied to the inner surface of a straight tube 6. Then, stems 10 and 10' having electrodes 8 and 8' and evacuation tubes 9 and 9' are fused to the ends of the straight tube 6. At the same time, the central area of the straight tube 6 is softened by heating with a burner 11. Immediately after the fusion of the stems 10 and 10' is completed, the straight tube 6 is rolled into a U-form by applying a roller to the central area of the tube 6. After this process is finished, the U-shaped tube 6' is evacuated, the electrodes 8 and 8' are activated, the tube 6' is charged with a given gas and then the evacuation tubes 9 and 9' are chipped off, thereby producing a U-shaped fluorescent lamp which can be efficiently mass-produced and has good quality.

Description

[Detailed description of the invention] Sitting on the top of the cliff! The present invention relates to a method for manufacturing U-shaped or double U-shaped fluorescent lamps used in light bulb-type fluorescent lamps and the like.

U-shaped and double U-shaped fluorescent lamps have a much smaller outer diameter than regular straight tube and ring-shaped fluorescent lamps, and can be made more compact. The lamp has received awards in various fields.

Such U-shaped or double U-shaped fluorescent lamps are generally manufactured using U-shaped or double U-shaped bulbs. For example, the manufacturing process of a U-shaped fluorescent lamp will be described below with reference to FIGS. 8(a) to 8(d).

First, prepare the straight pipe type valve (1) shown in Fig. 8 (a), and use a bending roller (not shown) etc. to convert it into the shape shown in Fig. 8 (a).
As shown in (c) of FIG. 8, a fluorescent light vA (2) is formed on the inner circumferential surface of a zero-order U-shaped bulb (1°) which is bent into a U-shape as shown in (b). This fluorescent film formation is caused by the U-shaped bulb (
Pour the y3 suspension, which is a mixture of phosphor, binder, and solvent, into 1゛) and apply it to the inner circumferential surface of the U-shaped bulb (1゛), then bake it to open the U-shaped bulb (1°). This is done in the process of removing things on the inner peripheral surfaces of both ends with a brush or the like. after that,
A stem (4) having electrodes (3) (3°) as shown in Part 8 (d) in both open ends of the U-shaped bulb (1゛).
(4°), then stem (4) (4')
Using the exhaust pipe (5) (5°) that extends further, exhaust the inside of the U-shaped valve (1°), activate the electrode, fill in inert gas and mercury, and finally exhaust pipe (5) (5' ) to tip off.

One point: The manufacturing of the Type 1 fluorescent lamp mentioned above had the following problems.

[1] To apply the phosphor IE and suspension to the curved inner surface of the U-shaped bulb, put the suspension into the U-shaped bulb from the openings at both ends of the U-shaped bulb with the openings at both ends facing down. Spray the suspension using a jet method, or pour the suspension into the U-shaped valve with both openings facing upwards, then turn the U-shaped valve upside down and remove any excess suspension inside. This is done by draining the turbid liquid. However, this type of application is laborious and difficult to mass-produce, and it is technically difficult to uniformly apply the suspension to the inner circumferential surface of the U-shaped valve. There were variations in the thickness of the fluorescent film on the inner peripheral surface, which deteriorated the quality.

[2] After coating the inner peripheral surface of the U-shaped bulb with a phosphor suspension, it is fired. In order to achieve uniform firing, the center line of the bulb must be horizontal and the center line must be aligned with the center line. It is desirable to rotate the valve constantly, but this is not possible with the U-shaped valve, which prevents uniform firing and further deteriorates the quality.

[3] The fluorescent film inside both ends of the U-shaped bulb is removed by means such as inserting a rotating brush into both ends of the U-shaped bulb with both ends facing down. Because of the inconsistency, complicated and special removal equipment was required.

[5] When enclosing a stem at both ends of a U-shaped bulb, it is desirable to uniformly heat the outer periphery of both ends of the U-shaped bulb, but because of the U-shape, uniform heating is difficult and the stem enclosing performance is poor.

Incidentally, the above-mentioned problems also exist in the production of double U-shaped fluorescent lamps, and improvements have been desired.

0 '&c7) [' The present invention has been made in view of the above-mentioned conventional problems, and the technical means of the present invention to solve this problem is to form a fluorescent film at the stage of a straight tube type bulb and then apply it to the stem. Along with sealing,
When sealing the stem, the straight pipe valve is heated and softened, and after the stem is sealed, the straight pipe valve is bent into a U shape.When bending into a double U shape, the straight pipe valve is bent once into the U shape. Immediately after forming, the U-shaped valve is bent again.

According to the above-mentioned technical means, the production of U-shaped or double U-shaped fluorescent lamps is the same as the stem-sealing process of general straight tube fluorescent lamps, and the same manufacturing equipment can be used, making mass production possible. This makes it possible to improve performance and quality. Furthermore, by heating the valve at the stem sealing stage, a special valve heating step provided for the valve bending process can be omitted, which is advantageous in terms of index and equipment.

1. To explain the manufacturing process of the U-shaped fluorescent lamp according to the present invention with reference to FIG. 1, first, as shown in FIG. The first valve is attached to the inner peripheral surface of the valve (6).
A fluorescent film (7) is formed as shown in (b) of the figure. This phosphor film is formed by standing the straight tube bulb (6) vertically and flowing a slurry containing the phosphor through the opening at the top, as in the case of manufacturing a general straight tube fluorescent lamp. 6) The process of applying the suspension to the inner peripheral surface of the straight pipe valve (6) after applying the suspension.
The process of baking the applied suspension while rotating the tube horizontally around the central axis to form a fluorescent film (7), while keeping the straight tube type bulb (6) horizontal, inserting brushes into the openings at both ends. This can be done by inserting the brush and rotating both the brush and the bulb relative to each other to remove the fluorescent film on both ends of the bulb. By doing this, the manufacturing equipment for general straight tube fluorescent lamps can be used as is. Moreover, the fluorescent film (7) can be mass-produced with high quality and can be produced similarly to a general straight tube fluorescent lamp.

After the fluorescent film is formed, the electrodes (8) (8°) and the exhaust pipe (9) are attached to both ends of the straight bulb (6), as shown in Fig.
) (9"), and at the time of sealing, the central part of the straight valve (6) is heated and softened with a burner (11). Immediately after the sealing is completed, as will be described later, a curved roller (12) is applied to the center of the straight tube type valve (6), and the straight tube type valve (6) is moved to the first position using the curved roller (12). As shown in (d) in the figure, it is bent into a U-shape. After this bending, the U-shaped valve (6") is exhausted, electrode activated, predetermined gas is filled in, and exhaust pipe tip-off is performed. A U-shaped fluorescent lamp is obtained.

In addition, when manufacturing a double U-shaped fluorescent lamp, the (
Immediately after the U-shaped bending process (d), the U-shaped bulb (6°) may be further bent into a U-shape from the middle as shown in FIG. 1 (e).

Next, a specific example of an apparatus for carrying out the steps of stem sealing and valve bending will be described with reference to FIGS. 2 to 7.

In FIGS. 2 to 5, Pl, P2, and Pa are horizontal first, second, and third positions arranged in parallel at equal intervals, and the straight pipe valve (6) is carried into the first position P1. )
is sent to a second position P2 by a first transfer body (13) that cranks vertically and horizontally between P and -P2, where stem sealing and valve heating are performed. Also, the second position P
Straight pipe valve with stem sealing and valve heating performed in step 2 (
6) is the second crank that moves vertically and horizontally between pt and Pa.
It is sent to the third position pa by the transport body (14), and is bent into a U shape at the third position P3. First and second transfer bodies <13) (14) are integral, and valve transfer between pl and p2 and valve transfer between P2 and P are performed simultaneously.

At both ends of the second position P2 are sealing heads (15) (1
5°) are placed opposite each other, and both have the same structure and perform the same operation.A specific example of the 7-door (15) for one sealing will be explained with reference to Figure 6. (16) is a movable unit that moves back and forth. Stand, (
17) is a head body installed on a movable base (16), (
18) is a mount pin extending forward from the head body (17), (19) is a burner arranged around the mount pin (18), and (20) is a second position P2 extending forward from the head body (17). Straight pipe valves delivered to (
6) is a chuck that holds the

This sealing head (15) is initially in a retracted position in which the stem (10) is fed to the mounting pin (18). When the straight pipe valve (6) is sent to the second position P2 by the first transfer body (13), the sealing head (15)
moves forward, the chuck (20) clamps the straight pipe valve (6), and the mount pin (18) fits and holds the stem (10) into the open end of the straight pipe valve (6). In this state, rotate the straight pipe valve (6) via the chuck (20),
A fixed burner (19) connects the valve (6) and stem (10).
) is heated and melted to seal the stem.At the same time, the burner (11) located at the second position P2 mainly heats and softens the central portion of the straight tube type valve (6). When this stem sealing and valve heating are completed, the straight pipe valve (
6) stops rotating, the second transfer body (14) rises to pick up the straight pipe valve (6), the chuck (20) is removed, and the sealing head (15) retreats. Second transport body (14
) moves the straight pipe valve (6) immediately after stem sealing to the third position P3, and in synchronization with this, the first transfer body (13) moves the next straight pipe valve (6) to the second position P, Move to
The sealing head (15) repeats the above operation.

In the center of the third position P3 is a two-part curved roller (12) that moves up and down, and at one end is an exhaust head (21).
When the straight pipe valve (6) is carried into the third position P3, the zero bending roller (12), which has a bending head (22) arranged at the other end, has two dividing rollers (12) on one side of its central part.
a) Stop by pinching it from above and below at (12b). A specific example of the exhaust head (21) is shown in FIG. 7, (23)
is the head body installed on a movable table (23°) that moves back and forth, (24) is the exhaust and gas filling opening formed inside the front center of the helad body (23), and (25) is the opening. A ring-shaped elastic sealing material fitted into the portion (24), (
Reference numeral 26) denotes a ring-shaped nut for compressing the sealing material which is screwed onto the outlet portion of the opening (24), and is rotated by a lever (26a). (27) is an exhaust pipe tip-off burner plate installed on a movable base (22) in front of the head body (23).

Furthermore, the bending head (22) located opposite the exhaust head (21) chucks one end of the straight pipe valve (6) carried into the third position P3 and horizontally moves it in the direction of the chain line arrow in FIG. It is exclusively used for bending, which makes approximately A circular movement in the direction shown. However, the bending head (22) of the straight pipe valve (6)
) is tipped off beforehand with the sealing head (15') in the second position P2.

When the straight pipe valve (6) is carried into the third position P3 by the second transfer body (14), the exhaust head (21) and the bending head (22), which were in the retracted position, move forward and the bending head ( 22) holds the outer periphery of one end of the straight valve (6), and the exhaust head (21) connects the exhaust pipe (9) at the other end of the straight valve (6) to the burner plate (27) and the nut (26).
), pass it through the sealing material (25), and then
) to compress the sealing material (25) and tighten the exhaust pipe (9).
It is supported airtightly by making pressure contact with the outer periphery of the. At the same time, a bending roller (12) is set in the center of the straight pipe valve (6). In this state, from the exhaust head (21) to the exhaust pipe (9)
Fill the straight pipe valve (6) with nitrogen gas or the like at about atmospheric pressure through the straight pipe valve (6), move the bending head (22) horizontally, and bend the straight pipe valve (6) horizontally into a U shape. Process. After that, with the exhaust head (21) attached to the υ-shaped valve (6°), exhaust, electrode activation, gas filling, tip-off, etc. are sequentially performed using the exhaust head (21).

Note that the U-shaped bending process for straight pipe valves is not limited to the horizontal direction, but can also be performed vertically or diagonally.
In addition, a bending roller is applied to the center of a straight pipe valve, both ends of the valve are held with chucks, and both ends of the valve are rotated radially simultaneously or sequentially using the bending roller as a fulcrum to bend into a υ shape. You can also do this.

According to the present invention, the fluorescent film coating process for U-shaped or double U-shaped fluorescent lamps can be performed easily and with high quality using the manufacturing equipment for general straight tube fluorescent lamps, thereby improving mass production. It is possible to provide a method for manufacturing a U-shaped or double U-shaped fluorescent lamp that is excellent in terms of performance and quality.

[Brief explanation of drawings]

Fig. 1 is a schematic process diagram for explaining the present invention in detail, Figs. The figure is a side view, 4th
5 and 5 are front views from the X and Y directions of FIG. 2, FIG. 6 is a sectional view of the sealing head portion of FIG. 4, and FIG. 7 is a cross-sectional view of the exhaust and throat portions of FIG. FIG. FIG. 8 is a schematic process diagram for explaining the manufacturing method of a conventional U-shaped fluorescent lamp. (6) - Straight tube bulb, (7) - Fluorescent film, (8) -
・−・Electrode, (10)・−Stem, (12)・−・−・
Curved roller.

Claims (1)

[Claims] (1) Step of forming a fluorescent film on the inner circumferential surface of the straight tube bulb, sealing the stem equipped with electrodes at both end openings of the straight tube bulb with the fluorescent film formed thereon, and sealing the stem with electrodes at the center of the straight tube bulb. The process of heating and softening the part, after sealing the stem, a bending roller is applied to the center of the straight pipe valve, and the straight pipe valve is removed from the bending roller.
A method for manufacturing a fluorescent lamp, comprising a step of bending it into a shape.